Merge tag 'for-linus-v3.10-rc1-2' of git://oss.sgi.com/xfs/xfs

Pull xfs update (#2) from Ben Myers:

 - add CONFIG_XFS_WARN, a step between zero debugging and
   CONFIG_XFS_DEBUG.

 - fix attrmulti and attrlist to fall back to vmalloc when kmalloc
   fails.

* tag 'for-linus-v3.10-rc1-2' of git://oss.sgi.com/xfs/xfs:
  xfs: fallback to vmalloc for large buffers in xfs_compat_attrlist_by_handle
  xfs: fallback to vmalloc for large buffers in xfs_attrlist_by_handle
  xfs: introduce CONFIG_XFS_WARN

fs/xfs/Kconfig

@@ -69,6 +69,19 @@ config XFS_RT
 
 	  If unsure, say N.
 
+config XFS_WARN
+	bool "XFS Verbose Warnings"
+	depends on XFS_FS && !XFS_DEBUG
+	help
+	  Say Y here to get an XFS build with many additional warnings.
+	  It converts ASSERT checks to WARN, so will log any out-of-bounds
+	  conditions that occur that would otherwise be missed. It is much
+	  lighter weight than XFS_DEBUG and does not modify algorithms and will
+	  not cause the kernel to panic on non-fatal errors.
+
+	  However, similar to XFS_DEBUG, it is only advisable to use this if you
+	  are debugging a particular problem.
+
 config XFS_DEBUG
 	bool "XFS Debugging support"
 	depends on XFS_FS

fs/xfs/mrlock.h

@@ -22,12 +22,12 @@
 
 typedef struct {
 	struct rw_semaphore	mr_lock;
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	int			mr_writer;
 #endif
 } mrlock_t;
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 #define mrinit(mrp, name)	\
 	do { (mrp)->mr_writer = 0; init_rwsem(&(mrp)->mr_lock); } while (0)
 #else
@@ -46,7 +46,7 @@ static inline void mraccess_nested(mrlock_t *mrp, int subclass)
 static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
 {
 	down_write_nested(&mrp->mr_lock, subclass);
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	mrp->mr_writer = 1;
 #endif
 }
@@ -60,7 +60,7 @@ static inline int mrtryupdate(mrlock_t *mrp)
 {
 	if (!down_write_trylock(&mrp->mr_lock))
 		return 0;
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	mrp->mr_writer = 1;
 #endif
 	return 1;
@@ -68,7 +68,7 @@ static inline int mrtryupdate(mrlock_t *mrp)
 
 static inline void mrunlock_excl(mrlock_t *mrp)
 {
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	mrp->mr_writer = 0;
 #endif
 	up_write(&mrp->mr_lock);
@@ -81,7 +81,7 @@ static inline void mrunlock_shared(mrlock_t *mrp)
 
 static inline void mrdemote(mrlock_t *mrp)
 {
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	mrp->mr_writer = 0;
 #endif
 	downgrade_write(&mrp->mr_lock);

fs/xfs/xfs.h

@@ -24,6 +24,11 @@
 #define XFS_BUF_LOCK_TRACKING 1
 #endif
 
+#ifdef CONFIG_XFS_WARN
+#define XFS_WARN 1
+#endif
+
+
 #include "xfs_linux.h"
 
 #endif	/* __XFS_H__ */

fs/xfs/xfs_alloc_btree.c

@@ -386,7 +386,7 @@ const struct xfs_buf_ops xfs_allocbt_buf_ops = {
 };
 
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 STATIC int
 xfs_allocbt_keys_inorder(
 	struct xfs_btree_cur	*cur,
@@ -442,7 +442,7 @@ static const struct xfs_btree_ops xfs_allocbt_ops = {
 	.init_ptr_from_cur	= xfs_allocbt_init_ptr_from_cur,
 	.key_diff		= xfs_allocbt_key_diff,
 	.buf_ops		= &xfs_allocbt_buf_ops,
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	.keys_inorder		= xfs_allocbt_keys_inorder,
 	.recs_inorder		= xfs_allocbt_recs_inorder,
 #endif

fs/xfs/xfs_bmap_btree.c

@@ -813,7 +813,7 @@ const struct xfs_buf_ops xfs_bmbt_buf_ops = {
 };
 
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 STATIC int
 xfs_bmbt_keys_inorder(
 	struct xfs_btree_cur	*cur,
@@ -853,7 +853,7 @@ static const struct xfs_btree_ops xfs_bmbt_ops = {
 	.init_ptr_from_cur	= xfs_bmbt_init_ptr_from_cur,
 	.key_diff		= xfs_bmbt_key_diff,
 	.buf_ops		= &xfs_bmbt_buf_ops,
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	.keys_inorder		= xfs_bmbt_keys_inorder,
 	.recs_inorder		= xfs_bmbt_recs_inorder,
 #endif

fs/xfs/xfs_btree.h

@@ -215,7 +215,7 @@ struct xfs_btree_ops {
 
 	const struct xfs_buf_ops	*buf_ops;
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	/* check that k1 is lower than k2 */
 	int	(*keys_inorder)(struct xfs_btree_cur *cur,
 				union xfs_btree_key *k1,

fs/xfs/xfs_dir2_node.c

@@ -993,7 +993,7 @@ xfs_dir2_leafn_rebalance(
 	xfs_dir2_leaf_t		*leaf1;		/* first leaf structure */
 	xfs_dir2_leaf_t		*leaf2;		/* second leaf structure */
 	int			mid;		/* midpoint leaf index */
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	int			oldstale;	/* old count of stale leaves */
 #endif
 	int			oldsum;		/* old total leaf count */
@@ -1022,7 +1022,7 @@ xfs_dir2_leafn_rebalance(
 	ents2 = xfs_dir3_leaf_ents_p(leaf2);
 
 	oldsum = hdr1.count + hdr2.count;
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	oldstale = hdr1.stale + hdr2.stale;
 #endif
 	mid = oldsum >> 1;

fs/xfs/xfs_ialloc_btree.c

@@ -272,7 +272,7 @@ const struct xfs_buf_ops xfs_inobt_buf_ops = {
 	.verify_write = xfs_inobt_write_verify,
 };
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 STATIC int
 xfs_inobt_keys_inorder(
 	struct xfs_btree_cur	*cur,
@@ -310,7 +310,7 @@ static const struct xfs_btree_ops xfs_inobt_ops = {
 	.init_ptr_from_cur	= xfs_inobt_init_ptr_from_cur,
 	.key_diff		= xfs_inobt_key_diff,
 	.buf_ops		= &xfs_inobt_buf_ops,
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	.keys_inorder		= xfs_inobt_keys_inorder,
 	.recs_inorder		= xfs_inobt_recs_inorder,
 #endif

fs/xfs/xfs_inode.c

@@ -287,7 +287,7 @@ xfs_ilock_demote(
 	trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
 }
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 int
 xfs_isilocked(
 	xfs_inode_t		*ip,

fs/xfs/xfs_ioctl.c

@@ -422,9 +422,12 @@ xfs_attrlist_by_handle(
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
-	kbuf = kzalloc(al_hreq.buflen, GFP_KERNEL);
+	kbuf = kmem_zalloc(al_hreq.buflen, KM_SLEEP | KM_MAYFAIL);
+	if (!kbuf) {
+		kbuf = kmem_zalloc_large(al_hreq.buflen);
 		if (!kbuf)
 			goto out_dput;
+	}
 
 	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
 	error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
@@ -436,7 +439,10 @@ xfs_attrlist_by_handle(
 		error = -EFAULT;
 
  out_kfree:
-	kfree(kbuf);
+	if (is_vmalloc_addr(kbuf))
+		kmem_free_large(kbuf);
+	else
+		kmem_free(kbuf);
  out_dput:
 	dput(dentry);
 	return error;

fs/xfs/xfs_ioctl32.c

@@ -373,9 +373,12 @@ xfs_compat_attrlist_by_handle(
 		return PTR_ERR(dentry);
 
 	error = -ENOMEM;
-	kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
+	kbuf = kmem_zalloc(al_hreq.buflen, KM_SLEEP | KM_MAYFAIL);
+	if (!kbuf) {
+		kbuf = kmem_zalloc_large(al_hreq.buflen);
 		if (!kbuf)
 			goto out_dput;
+	}
 
 	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
 	error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
@@ -387,7 +390,10 @@ xfs_compat_attrlist_by_handle(
 		error = -EFAULT;
 
  out_kfree:
-	kfree(kbuf);
+	if (is_vmalloc_addr(kbuf))
+		kmem_free_large(kbuf);
+	else
+		kmem_free(kbuf);
  out_dput:
 	dput(dentry);
 	return error;

fs/xfs/xfs_linux.h

@@ -293,22 +293,34 @@ static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 #define ASSERT_ALWAYS(expr)	\
 	(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 
-#ifndef DEBUG
-#define ASSERT(expr)	((void)0)
+#ifdef DEBUG
+#define ASSERT(expr)	\
+	(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 
 #ifndef STATIC
-# define STATIC static noinline
+# define STATIC noinline
 #endif
 
-#else /* DEBUG */
+#else	/* !DEBUG */
+
+#ifdef XFS_WARN
 
 #define ASSERT(expr)	\
-	(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
+	(unlikely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
 
 #ifndef STATIC
-# define STATIC noinline
+# define STATIC static noinline
+#endif
+
+#else	/* !DEBUG && !XFS_WARN */
+
+#define ASSERT(expr)	((void)0)
+
+#ifndef STATIC
+# define STATIC static noinline
 #endif
 
+#endif /* XFS_WARN */
 #endif /* DEBUG */
 
 #endif /* __XFS_LINUX__ */

fs/xfs/xfs_message.c

@@ -92,6 +92,14 @@ xfs_alert_tag(
 	BUG_ON(do_panic);
 }
 
+void
+asswarn(char *expr, char *file, int line)
+{
+	xfs_warn(NULL, "Assertion failed: %s, file: %s, line: %d",
+		expr, file, line);
+	WARN_ON(1);
+}
+
 void
 assfail(char *expr, char *file, int line)
 {

fs/xfs/xfs_message.h

@@ -57,6 +57,7 @@ do {									\
 	xfs_printk_ratelimited(xfs_debug, dev, fmt, ##__VA_ARGS__)
 
 extern void assfail(char *expr, char *f, int l);
+extern void asswarn(char *expr, char *f, int l);
 
 extern void xfs_hex_dump(void *p, int length);
 

fs/xfs/xfs_trans.h

@@ -405,7 +405,7 @@ typedef struct xfs_trans {
 	int64_t			t_res_fdblocks_delta; /* on-disk only chg */
 	int64_t			t_frextents_delta;/* superblock freextents chg*/
 	int64_t			t_res_frextents_delta; /* on-disk only chg */
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 	int64_t			t_ag_freeblks_delta; /* debugging counter */
 	int64_t			t_ag_flist_delta; /* debugging counter */
 	int64_t			t_ag_btree_delta; /* debugging counter */
@@ -433,7 +433,7 @@ typedef struct xfs_trans {
 #define	xfs_trans_get_block_res(tp)	((tp)->t_blk_res)
 #define	xfs_trans_set_sync(tp)		((tp)->t_flags |= XFS_TRANS_SYNC)
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(XFS_WARN)
 #define	xfs_trans_agblocks_delta(tp, d)	((tp)->t_ag_freeblks_delta += (int64_t)d)
 #define	xfs_trans_agflist_delta(tp, d)	((tp)->t_ag_flist_delta += (int64_t)d)
 #define	xfs_trans_agbtree_delta(tp, d)	((tp)->t_ag_btree_delta += (int64_t)d)